n. 1. The shell or hard external covering in which the kernel of a nut is inclosed. [ 1913 Webster ]
2. Hence, a thing of little compass, or of little value. [ 1913 Webster ]
3. (Zool.) A shell of the genus Nucula. [ 1913 Webster ]
in a nutshellin a summarized and very abbreviated form; -- of statments, descriptions, reports, and other communications; as, to describe the convention in a nutshell. -- To be in a nutshellor To lie in a nutshell, , to be within a small compass; to admit of very brief or simple determination or statement. “The remedy lay in a nutshell.” Macaulay. [ 1913 Webster +PJC ]